Vitamins are a group of vital substances without which normal functioning of all cellular structures is impossible. Vitamin deficiency negatively impacts overall health and the function of individual organs.
Cyclosporine is widely used as an effective immunosuppressant to suppress the graft-versus-host reaction after bone marrow, kidney, liver, and heart transplantation and in the treatment of certain autoimmune diseases.
Lithium ions are absorbed in the gastrointestinal tract. It is excreted in urine (95%), feces (1%), and sweat (5%). Lithium concentrations in saliva are significantly higher than those in serum. The blood-brain barrier is permeable to lithium, with its concentration in cerebrospinal fluid being 40% of that in serum.
Theophylline inhibits phosphodiesterase, increases cAMP levels in cells, and antagonizes adenosine receptors in the lungs, causing bronchi to dilate. Of the xanthines, theophylline is the most effective bronchodilator.
Phenobarbital is primarily used as an anticonvulsant. It is administered orally and is almost completely (up to 80%) absorbed in the small intestine. Peak drug concentrations are reached 2-8 hours after a single oral dose and 1.5-2 hours after intramuscular administration.
Digitoxin is a cardiac glycoside that differs from digoxin in its duration of action due to its superior lipid solubility. Digitoxin is almost completely absorbed from the gastrointestinal tract. In serum, digitoxin binds to albumin.
Digoxin is one of the most commonly used cardiac glycosides. It is typically taken for a month. Absorption from the gastrointestinal tract accounts for 60-80% of the administered dose. Most of the drug is eliminated from the blood by the kidneys. Digoxin is prescribed primarily for heart failure and as an antiarrhythmic agent, along with other medications.
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